适用于：要求随负载的性质逐级调速的各种传动机械如机床、矿山、冶金、纺织、印染、化工等行业。

Applications:widely used in such industry which have step changes of rotational speed to meet the requirements of load character, as machine tools, mining, metallurgy, textile, printing and dyeing, chemical industry and agricultural machinery, etc.

特点：采用改变绕组的接法来变换电机的转速和输出功率，使其与机械设备的负载特性相匹配，简化了变速系统，高效、节能

Features: to meet the requirements of load character simplify speed-changing systems by changing the connection to obtain different output and speed. Simplify speed-changing systems.high efficiency，energy

saving

变速方案：双速、三速、四速

Pole-changing mode:double, three or four speed